Turn it on go to menu custom setting menu then braketing /flash then toggle right and turn it on
SOURCE: Nikon D40 will not flash
The lightning bolt icon in viewfinder blinks when flash is not ready, this can happen if flash doesnt pop up all the way, or if flash strobe tube is bad.
SOURCE: nikon d40 flash won't fire
My d40 did the same thing and the guy at Wolf Camera said a sensor is bad. The falsh was up but every time I focused it tried to pop up the flash again but it would not fire.
I had 2 options. Send it off for 8 weeks to Nikon at a $240 minimum or buy a flash attachment for $100. I chose the $100 option.
SOURCE: nikon d40 built in flash not firing but it popped up
there is a sensor in there that tells the camera the flash is up you need to take it to a repair shop its not a at home thing
SOURCE: can you use nikon sb25 flash with d40 dslr?
You can but with limitations;
Save me explaining,please read this http://forums.steves-digicams.com/nikon-dslr/137618-sb-25-d40-non-ttl-auto-mode.html
SOURCE: Nikon D40 is taking Dark Pictures. Flash is
kindly see the aparture and speed of xpouser and the iso also if the iso is 100 change the iso to 400 or 800 or u can select he programme option for the best xpousers
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